Re: [ECOS] Re: Redboot v2.04, IXP4XX and Flash v2

[Gary Thomas <gary at mlbassoc dot com>]

Alexey Shusharin wrote:
> Ð ÐÑÐ, 06/02/2008 Ð 05:33 -0700, Gary Thomas ÐÐÑÐÑ:
> > Alexey Shusharin wrote:
> > > Ð ÐÑÐ, 06/02/2008 Ð 11:52 +0100, Antonello Lombardinilo ÐÐÑÐÑ:
> > > > Alexey Shusharin writes: 
> > > >
> > > > > . ..., 06/02/2008 . 08:51 +0100, Antonello Lombardinilo .....:
> > > > > > > Hi, 
> > > > > > >
> > > > > > > Flash V2 board driver should use "CYG_FLASH_DRIVER" macro to define each
> > > > > > > flash device. Just find this macro. 
> > > > > > >
> > > > > > > grep -R CYG_FLASH_DRIVER ./ 
> > > > > > >
> > > > > > > But are you sure that you need two flash device support?
> > > > > > > What are you going to keep in boot flash (512 KB)? 
> > > > > > >
> > > > > > > Best regards
> > > > > > > Alexey Shusharin 
> > > > > > Hi,  
> > > > > >
> > > > > > I would use the boot flash for RedBoot Image, FIS directory and
> > > > > > Redboot config.  
> > > > > >
> > > > > > I'm not sure that I need a two flash device support.
> > > > > > Any other solution is well appreciated.  
> > > > > Are you going to use FIS on the second flash device? If yes you can keep
> > > > > Redboot config there and don't make access to boot flash device. It's
> > > > > usual way. 
> > > > >
> > > > > Best regards
> > > > > Alexey Shusharin 
> > > > Hi, 
> > > >
> > > > I would to use second flash for zImage, ramdisk and linux jffs2.
> > > > So, if I understood correctly, I want to use FIS on second device. 
> > > You can't use FIS and linux jffs2 together on one chip. Moreover, eCos
> > > doesn't have linux-compatible NAND flash driver.
> > Malarky!  I do this all the time.  The Linux MTD layer understands
> > the FIS layout and will happily work with it to partition your device.
> > JFFS2 can then be used on some/all of the partitions, NAND or NOR.
>
> Sorry! I really didn't know that it's possible with NAND flash.

I did this [6] years ago for the MOAB, so the NAND support may be a
bit stale, but it's more than feasible.  As for NOR FLASH, it's up
to date and used daily :-)

> > > > In this scenario, why redboot don't make access to boot flash ?
> > > > Where the Redboot image are stored ?
> > > Redboot just runs from boot flash (or loads to ram). In this case you
> > > don't need flash driver.
> > >
> > > > How can update Redboot ?
> > > You can't.
> > >
> > > > There is any board that implement this scenario?
> > > e.g. LPC-E2294
> > > (http://sgs.gomel.by/sg/articles/olpce2294/index.html)

--
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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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